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vdboor
Guru
Joined: 03 Dec 2003
Posts: 592
Location: The Netherlands
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 Posted: Wed Jan 21, 2004 10:05 am Post subject: memory: 256+256+512 = 1024, or not? (solved) |
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I have a really weird situation with my memory. Last week I've added more memory to my system (a 512 mb stick), but the 'free' command seams to think there isn't 1024 mb in my system at all:
Take a look at the free command:
| Code: | root@hal9000 root # free -m
total used free shared buffers cached
Mem: 882 820 62 0 174 353
-/+ buffers/cache: 292 590
Swap: 188 0 188 |
The sensors from my mainboard seam to prove there are 3 memory sticks in my system:
| Code: | root@hal9000 root # sensors
eeprom-i2c-0-50
Adapter: SMBus Via Pro adapter at 0400
Algorithm: Non-I2C SMBus adapter
Memory type: DDR SDRAM DIMM
Memory size (MB): 256
eeprom-i2c-0-51
Adapter: SMBus Via Pro adapter at 0400
Algorithm: Non-I2C SMBus adapter
Memory type: DDR SDRAM DIMM
Memory size (MB): 256
eeprom-i2c-0-52
Adapter: SMBus Via Pro adapter at 0400
Algorithm: Non-I2C SMBus adapter
Memory type: DDR SDRAM DIMM
Memory size (MB): 512
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..but why isn't the total memory size 1024 mb? 
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Last edited by vdboor on Thu Jan 22, 2004 3:41 pm; edited 1 time in total |
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jmz2
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Joined: 13 Jan 2004
Posts: 421
Location: Finland
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| Posted: Wed Jan 21, 2004 10:47 am Post subject: |
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Does you mobo support 512 MB chips? you'll find it in the specs. There should also be a list of memory combinations you can use. Most likely you'll have to put the 512 chip to the first bank.
And if you're using older SDRAM memory, check if the 512 chip is two-sided (total of 16 black memory modules on both sides of the chip). In that case, and if your other chips are one-sided, you may need to leave the next bank empty. |
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celas
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Joined: 03 Mar 2003
Posts: 13
Location: UK
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| Posted: Wed Jan 21, 2004 12:43 pm Post subject: |
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| You need to compile the kernel to support 4GB memory space (somewhere under processor features) otherwise you'll only have access to about 830 MB or your memory. |
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vdboor
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Joined: 03 Dec 2003
Posts: 592
Location: The Netherlands
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| Posted: Wed Jan 21, 2004 3:24 pm Post subject: |
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| celas wrote: | | You need to compile the kernel to support 4GB memory space (somewhere under processor features) otherwise you'll only have access to about 830 MB or your memory. |
lol, it was indeed disabled in my setup. I'm recompiling now, but I think my issue is solved. The kernel help option told something similar too. 
(update: it's solved  thanks a lot)
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